# CVE-2026-53024: linux: In the Linux kernel, the following vulnerability has been resolved:  greybus: raw: fix use-after-free if write is cal...

CVE-2026-53024 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-53024, released June 25, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-53024
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 24, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  greybus: raw: fix use-after-free if write is called after disconnect  If a user writes to the chardev after disconnect has been called, the kernel panics with the following trace (with CONFIG_INIT_ON_FREE_DEFAULT_ON=y):          BUG: kernel NULL pointer dereference, address: 0000000000000218          ...         Call Trace:          <TASK>          gb_operation_create_common+0x61/0x180          gb_operation_create_flags+0x28/0xa0          gb_operation_sync_timeout+0x6f/0x100          raw_write+0x7b/0xc7 [gb_raw]          vfs_write+0xcf/0x420          ? task_mm_cid_work+0x136/0x220          ksys_write+0x63/0xe0          do_syscall_64+0xa4/0x290          entry_SYSCALL_64_after_hwframe+0x77/0x7f  Disconnect calls gb_connection_destroy, which ends up freeing the connection object. When gb_operation_sync is called in the write file operations, its gets a freed connection as parameter and the kernel panics.  The gb_connection_destroy cannot be moved out of the disconnect function, as the Greybus subsystem expect all connections belonging to a bundle to be destroyed when disconnect returns.  To prevent this bug, use a rw lock to synchronize access between write and disconnect. This guarantees that the write function doesn't try to use a disconnected connection.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-53024](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53024.md) | Jun 25, 2026 |
| Linux | linux Debian 14 | 7.0.10-1 | [DEBIAN-CVE-2026-53024](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53024.md) | Jun 25, 2026 |

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Data as of 2026-11-09T19:38:12Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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